cue/build: remove unused Scope field
cue/build: remove unused Scope field

Change-Id: I4fd40af6e8ca92e215e77a84e66f027f86e32e92
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/9346
Reviewed-by: CUE cueckoo <0f32a827c9a5f00281f936ac78b5ef3ba80a954c@gmail.com>
Reviewed-by: Paul Jolly <a027184a55211cd23e3f3094f1fdc728df5e0500@myitcv.org.uk>

cuelang/cue